Question & Answer: ed at (1.0, 1.0). The code uses the parametric equation of a circle. PI = 3.14159: dt = 0.01: for…..

2. The following is a pseudo code for generating consecutive points of a circle of radius 1.0, centered at (1.0, 1.0). The code uses the parametric equation of a circle. PI=3.14159; dt = 0.01; for (t = 0.0; t <=PI; t = t + dt){ point(1.0+cos(t), 1.0+ sin(t): point(1.0 - cos(0), 1.0- sin();) // Using symmetry Next, consider the following Java construct for line drawing: Point2D.Double start-new Point2D.Double(x1, yl); Point2D·Double end = new Point2D·Double(x2, y2); Shape segment - new Line2D.Double(start, end); 82.draw (segment) (10%) Write a Java program that generates points of the circle above and connects, via a line, every point on the circle to the next point on the circle. There is no need to actually draw the lines in a graphics objects (e.g., windows). Assume that the drawing infra-structure is available. a.

The following is a pseudo code for generating consecutive points of a circle of radius 1.0, centered at (1.0, 1.0). The code uses the parametric equation of a circle. PI = 3.14159: dt = 0.01: for (t – 0.0: t

Expert Answer

 

Point.java

/*
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* and open the template in the editor.
*/
package points;

import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

import java.util.ArrayList;

public class Point extends Application {

Pane pn = new Pane();
ArrayList<Circle> cir = new ArrayList<>();
@Override
public void start(Stage primaryStage) {

double wt = 600;
double ht = 400;

VBox info = new VBox();
info.setPadding(new Insets(5, 5, 5, 5));
info.setStyle(“-fx-border-color: red”);

Label lbl1 = new Label(“INSTRUCTIONS:”);
Label lbl2 = new Label(“Add: Left Click”);
Label lbl3 = new Label(“Remove: Right Click”);

info.getChildren().addAll(lbl1, lbl2, lbl3);
Pane infPn = new Pane(info);
infPn.setPadding(new Insets(10, 10, 10, 10));

// Pane
pn.getChildren().addAll(infPn);
info.setLayoutX(10);
info.setLayoutY(10);

pn.setOnMouseClicked(e-> {
double n = e.getX();
double q = e.getY();
if (infPn.contains(n, q)) return;

if (e.getButton() == MouseButton.PRIMARY) {
Circle ccl = pointDraw(n,q);
cir.add(ccl);
pn.getChildren().add(ccl);
dispBoundary();

} else if (e.getButton() == MouseButton.SECONDARY) {
rmPnt(n, q);
dispBoundary();

}

});

Scene scene = new Scene(pn, wt, ht);
primaryStage.setScene(scene);
primaryStage.setTitle(“Drawing Board”);
primaryStage.show();
}

private Circle pointDraw(double n, double q) {
Circle ccl = new Circle(n, q, 10, Color.TRANSPARENT);
ccl.setStroke(Color.BLACK);
return ccl;
}

private void dispBoundary() {

rmRec(); // removes old rect

if (cir.size() == 0) return;

// assume first circle is the current bounding limit
Circle above = cir.get(0);
Circle below = cir.get(0);
Circle rt = cir.get(0);
Circle lt = cir.get(0);
// get lowest n,q and get highest n,q
for (Circle ccl : cir) {
if (ccl.getCenterX() < lt.getCenterX()) lt = ccl;
if (ccl.getCenterX() > rt.getCenterX()) rt = ccl;
if (ccl.getCenterY() > below.getCenterY()) below = ccl;
if (ccl.getCenterY() < above.getCenterY()) above = ccl;
}
// all circles have the same radius
double wt = rt.getCenterX() – lt.getCenterX() + above.getRadius() * 2;
double ht = below.getCenterY() – above.getCenterY() + above.getRadius() * 2;
double cntX = (rt.getCenterX() + lt.getCenterX()) / 2;
double cntY = (above.getCenterY() + below.getCenterY()) / 2;

Rectangle rect = new Rectangle(cntX – wt / 2, cntY – ht / 2, wt, ht);
rect.setStroke(Color.BLACK);
rect.setFill(Color.TRANSPARENT);
pn.getChildren().add(rect);

}
private void rmPnt(double n, double q) {
ObservableList<Node> ls = pn.getChildren();
for (int uu = ls.size() – 1; uu >= 0; uu–) {
Node ccl = ls.get(uu);

if (ccl instanceof Circle && ccl.contains(n, q)) {
pn.getChildren().remove(ccl);
cir.remove(ccl);

break;
}
}
}

private void rmRec(){
ObservableList<Node> ls = pn.getChildren();

for (Node ccl : ls) {
if (ccl instanceof Rectangle) {
pn.getChildren().remove(ccl);

break;
}
}

}

public static void main(String[] args) {
Application.launch(args);
}
}

Output:

Question & Answer: ed at (1.0, 1.0). The code uses the parametric equation of a circle. PI = 3.14159: dt = 0.01: for..... 1

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